Order by disorder in a triangular lattice

Order by disorder and phase transitions in a highly frustrated spin model on the triangular lattice.
A. Honecker, D. C. Cabra, H.-U. Everts, P. Pujol, and F. Stauffer
Phys. Rev. B 84, 224410 (2011)

Snapshot of a configuration during a simulation for J < 0 at T = 10−3|J | on a 12 × 12 lattice. Periodic
boundary conditions are imposed at the edges.